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KMID : 0361920180480040236
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Korean Journal of Orthodontics
2018 Volume.48 No. 4 p.236 ~ p.244
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The effect of occlusogingival placement of clinical bracket points on the adaptation of a straight wire to the lingual arch form
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Abdi Amir Hossein
Motamedian Saeed Reza
Balaghi Ehsan
Nouri Mahtab
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Abstract
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Objective: The aim of this study is to compare the adaptation of a straight wire between brackets positioned at the mid-lingual surface and those placed gingivally by using a three-dimensional simulation software.
Methods: This cross-sectional study was performed using OrthoAid, an in-house software. The subjects were 36 adolescents with normal Class I occlusion. For each dental cast, two bracket positioning approaches, namely the middle and gingival, were examined. In the middle group, the reference points were placed on the mid-lingual surface of each tooth, while in the gingival group, the reference points were positioned lingually on the anterior teeth. A 4th degree polynomial was adopted, and the in-plane and off-plane root mean squares (RMSs) of the distances between the reference points and the fitted polynomial curve were calculated using the software. Statistical analysis was performed using the paired-samples t -test (α = 0.05).
Results: The mean in-plane RMS of the polynomial curve to the bracket distance in the gingival group was significantly lower than that in the middle group (p < 0.001). The off-plane RMS was higher in the gingivally positioned brackets in the maxilla than in the middle group (p < 0.001). However, the off-plane RMS in mandible was not statistically significantly different between the two groups (p = 0.274).
Conclusions: The results demonstrated that the gingival placement of lingual brackets on the anterior teeth could decrease the distance between a tooth and the straight wire.
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KEYWORD
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Orthodontics, Orthodontic brackets, Tooth movement techniques, Lingual orthodontics
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